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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abca7d1a6863445d691121cf14453a4ad829ccee98fe91326977f36c5a69e962' 
  AND token = 'GgmOsNanTth4lr/B+GQULb90OZRJtw4uyTfsr7upySY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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