Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d964960830e9bfc3a48bb0ac0f5c73e480a20e1c9eb07b4f218947b4bb87f2' 
  AND token = 'lsEUcJTELDZSB1nr0o12qXDEoQSFEL/+cDEDcOJ9lA4=' 
  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"
    }
  }
}