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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74994645ceca501d15ab0442245e85288dcf0e9758dabad692674e0bcd74e2f7' 
  AND token = 'nzaoA3Z/tDGaWqdHlGe3Zi1dNPMA5lC9jIFDaJ37cXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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