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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a9061ef6fda5e9ade20bcc6607d99c1fd845b7322dbfc20785908b7d206225' 
  AND token = '+q01nAVtR5xb78/EcqVaKlDhnlq/AQYOHkGkIPLXZBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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