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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7f70df224c321d1e30b46e42be896d35dc3cf26b097da83cb33f9ca2ffae0bfc' 
  AND token = 'ltuR0l37omcMaECQEwLmdtCj/p2ujeBHdR6r53p9mrI=' 
  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"
    }
  }
}