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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a817f63b1cd3dd161e38174629489d055b1cf29e577873f28fb81cd2ea81f3' 
  AND token = 'WrCkGudZLyp0wIu+UjwhuHtwd+WN7WR7cOaMyrw9VbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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