Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502977e15397ef66eed284248674fd4c4cf17df86c9e2743ce1244f6622d3410' 
  AND token = 'CCLEKHBL+n9erOdiCqibeVtD44h0WQwP4e8eCA/Cgu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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