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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1acc68f8629f69d03c6b751b397ca5ecf64517ff55d6582bca7c59e22616028' 
  AND token = 'IPX5vc17M7wAxM6/w81m9On0KiA7EwgBUqIvenx2eSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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