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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a183a365a3ce0ffcc35577831acad08fe9f4ca1949ade6f0233411566f8103' 
  AND token = '4gja9bU+kelvzlKn8oLf6lwicQt1MEi+pjlQawDu4FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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