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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4968fae0b18eba2ed337ee8da33dc7933d96976cc0c7705f17501df07f1cbcd' 
  AND token = 'NFYwRorWkAN1I6XAgMTUlMImd6g+WxCupNkV79DdL2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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