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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e352d5ffd395cba5a766b979f771e318b08716323eb8220a5095f0e8e97d3c3' 
  AND token = 'je7ZsA0KXIhegbv2EKXyFWbJOT8gXgHBdi1o16EmZrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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