SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452c9fd766f0c3a2991e7cbbc0feae72cc70ced7ded462a8c2b19b12cb9fc680' 
  AND token = '9bmGmvWHvgzlFtM6hTCKA3chEnqPBOY/WTISGZBkXCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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