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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad6615f28a3fdf3a07ffa3e8fb2d1b6d9a72add2b1f4dca7b981aab62e5a8d9' 
  AND token = 'EEjfs8rSxDY2IZxArpEHX+CWEe5s5XWbyIzNfXbahiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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