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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda1252244afd5589041bf7ec5c85aa61b09b551115f587788462551054b85bc' 
  AND token = 'ixieIuZMdcBCPQEVctnMjqghzcEkr5dZOQ1rjc8Ucf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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