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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aedce6d5cd8e34aeefae6008ffe6a70c21738adc3abfc6437fde183cd8b62b0' 
  AND token = '6Zr+2iB3RH6cUCLUtjAdcpEbClOtOd/t52MXz88Pm1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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