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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4919158f63a267ee0168836b05e061dc244aefb2f2e797074139f6923d6ca9e' 
  AND token = 'T2thz85WzC7N2Xv3UBzougDbmyiht3RxH79gEJZnyiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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