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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0817db964ac6beb96bb9cb0f833f87d0d93b4ded1175e18bc9912c6e784b4c1e' 
  AND token = '4UdNDh5bmJCBqvV1tWUNw8KhA4NSX8XLHSUCh4ouoC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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