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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bfb7f11a607390fafa2dd93d9fff7c530f8cf719185af5195e2bbe05ba7553' 
  AND token = 'oPprcK4bSAq0GIl71EPWUPZpMG2mb8AqKF8qpfsSO+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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