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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3853e4924f1249d80906ed96d6004cac6bdd949f6264fd9f20607a9df557be1c' 
  AND token = 'IecDMQfP0GXjulXCep8VYoKpMbomxpLn6vVxt7h7mqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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