Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49f12b2aa3ccc1462d61218f60928b14eb31644c7a568f49f62f332d7d35a91' 
  AND token = 'srurP8quSXBoqsFr5wfxMMB5/c3aI5QPQZFwqUhD6WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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