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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32888ef3a05c7d248e1e07c1754e49138126699bb46128e5ed91038da5d02ccb' 
  AND token = 'MQFwsxKc6bcLHx6getZm9rp/vCkVvVDX+m8W0bmNj6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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