SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '042d8917944f2bbbebff91d72829da385f29bb1b5523f722196dfd9634586cbf' 
  AND token = 'X53DBc/G1vJcOVA33FnuKYuxJBMpGZjLkzhCTCeu6To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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