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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f1d128a294ee74d70c9e86e7ed56a216f6a992e8dab45ca8d4603364ecfe26' 
  AND token = 'JcGIMykJVbjR3NLWTeMjHStTfzk9OduqaR3z2WXv7yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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