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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50aae26a1c64e8538598adc5f89421a4c20a1c5581cde01c5853bcc8e047414f' 
  AND token = 'KRcQrn5SD9mAd5V/YYP9j+efmds0X6FtEhASXWZEDpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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