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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e126d306a57b0b6de622af5e3c00112b60594fd4517744e7f2de34255043bd' 
  AND token = 'n6QSzkDw77XDV8SMSPtqZIGfYcniCautonNGRkrpua0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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