Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a23182d3b692ee6f74b58ebbe1515c3078fea8bbbce9e337acaddcd201b3d6' 
  AND token = '/kfBh8Kql/qIsqZ/I7zOP/nJbCNGudas7VMdaMGxzyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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