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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbee43c0e9d2d0d60c09f01762b944f765872e663474015c731e56d2b7cd87b9' 
  AND token = 'denrmfeGz8lD+AsZRKdVR9NE19pkUmAc/qn9gvDUgWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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