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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac804e171796d5a5c953f2e03a9bb462c77e27e60f71cdbfb344a6527660085' 
  AND token = 'oFpOIk6vJopt5v6CL6VdyU1cYZN2zcP7PFRPO21w0sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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