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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c616e55a41f74daac672687d6a01603e5ec04afc2d9364046171e55d30cda92' 
  AND token = 'akveEvbXIU07XzjliJXcSgavVCq31kEN2P9Y0KHE8pU=' 
  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"
    }
  }
}