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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec6635e21098643ab9c29cb1e1df48b2cf7be46b15468d0ea191ea645bcdc63' 
  AND token = 'aQeNUQcasrac+t4op97H3It4xsCb3Ge456VEod01P2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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