Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14938ce3e361ce6fa34b70e2670c6e359afef6eed69d1f1091ba08131133285' 
  AND token = '2eLGA9qNnIR2WWDAk6Y+fl0yHZxx9CsCRoK9CIuP+60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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