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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df800b76caf3e57c27c01ac48f91687090f7e17b36fc71001c824a85a7ee69c' 
  AND token = 'HHMEtILXi7WKepb7wxKlW60RcveglcKpq3ZtXooNnPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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