Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ac29dabbee9056de661c702881030374a401f2239a26849dc0bda721e9aeea' 
  AND token = '6KVRA1HE3DGPgfrhxT7L8ZNwFIz3+QEtUn8t5cRHL7I=' 
  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"
    }
  }
}