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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0f98819d2930f3c838140552f4fae993a1a9dbc13781592f07a10e43244e75' 
  AND token = 'VaLPhwUILjWtjIPo64C3yZ9cc1i54kco9wZVNn53Oms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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