Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9ad6c0b5101d1a2ce76fe595fe25c49e7f05a44ed5ed2a240dc9074ed5d49c' 
  AND token = '7IHRYeqDYN0rA4DWDtLanYIwh6+mgE7JgFEeYbQBtLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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