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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a6a4d9da870d729898d374bc68e95a6790cecb189063e90868ac4da9cfaa95' 
  AND token = '5XZ7/IFQAhcs6Y1poTlS3lWBt9Jxee6gtd3nNxbYSpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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