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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a271959fd233c0c1565d4577665086dae1fbaf857c2513e5ad91639bffe526da' 
  AND token = '0U7VbPxfRQ0mQ+2mD9vcv7Jn4qtkTPPK+h/QEKerZH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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