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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e89615fc25f3abc5681471ab2b8ffd3c281b8780b81eb81b5b7a5d8a6ee5aa2c' 
  AND token = 'yE9E/jcRGK5gXDb+eXZ3NdlodbG8fuamJ6hurKgX/qI=' 
  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"
    }
  }
}