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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0c24a1ab778da2fc7925e8058a0ae9d39ca168d970358dcff30ee9bd115779' 
  AND token = 'CfrRsp1GFHT1dwunyJcY7sNbPM7hTD5aMTodaiuspxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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