Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3aefdeab60e81a393df8c41cf8ca7d4ee26b6b277dda210dd8af208dcda9d3' 
  AND token = 'lNFWz+i9sa2szNVfpoew68nXAWu8IWpShcMT5z3Uup8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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