SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '16e0587fad84a315aac9a51a9f466a5e27d1f641b3fd3b479c0d9bc525c34a76' 
  AND token = 'eyUykZQk8qww0Olrb/Tkvgr7BYGRBflFGTONQRRBous=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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