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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844ab651c8119d89780209fe27b8fc7109a96d4e55eb5f0bb56911fac8bab61e' 
  AND token = 'oYw/Hr0CfmQIZmc6bYtmBAuTaEsti2fKkc3xjGCAo/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00310

JSON explain

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