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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f478fef446ea7a5f4a8219565aad135d85604db1c38ff749f4be1c4a9f1cb2' 
  AND token = 'lgm1igKKT+98bg5xlna95WZQCKMS2J+xoHLzCr9TMQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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