Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9240eb7e323994e63a033d62006d303e2c3dbdb9f43a632820f3530dc4ce2a' 
  AND token = 'm7R1VRAdDO1G4ysF8m4ZUoU10MIZQY2Fd1XKajo6CCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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