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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d996cf3e868a80b0b0f82c859aa568d26b5fc85f34f070d9db274f9fd61c29c' 
  AND token = 'ZWPq/4wahudwnhdR6Eesx7BopkrIDnJ8Y48AxWcSZDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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