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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba6f9875b546a4a2477e56885c2e230e57712d1f03234dbfb3046ebdd526540' 
  AND token = 'AAqTVomCHT50w0vt0y63NdRbZr2CavUYq2j/F/TTexc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}