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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6effddebf08314757f0862a00e28476a61bff1761740758773a2c3ff746d0e1b' 
  AND token = '0EG6pBMtq8VIXpXwV+3IQePH5MpQRJVMxj0zAQJI0kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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