Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0c5528d6b05145ba6b92be0d9f0f260e3b551595855a849b3e0d965a3cab4d' 
  AND token = 'm5fRhqwL9XhgmXvdfLbEk7CDOEt3vP6zRcmtPQLAXFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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