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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4523d2b34b1d770e59666c49f75f2d4bc71c4ff97546902e1cde4fbee1397303' 
  AND token = 'p3YJ1QLm8533AFMdUp/zBd5rpmdTFLDH/hUSchU5AFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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