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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d8755534d2429436c07bf21ef1e44e01bacb04667dea75325eb8faef3e69ff' 
  AND token = 'qt/wUedM29FeLqesX6Kzy0eyY423yyZKPE4qm3aS6E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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