SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1923a7720135499a609d938afb0c11e752ee5cfc1d4c1dcb29cd628548d2982c' 
  AND token = '1twQ6JnKjFm1nyPWmdKzKDXRg+8JQro7g0p/p/Boc+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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