SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54a58788155227dbf5300040e67b21ef3d8fd4a52bcfbdcba24f69fc6623311' 
  AND token = 'B+KZrk9/X14McAuh1+qH9rfX5A6Gg1lEu6wi5hv7irU=' 
  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"
    }
  }
}