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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'db6796f36f19caa4ccc1bd591eb5cdd491a7a74fb40366d0fd26b2fb081aae14' 
  AND token = 'aqp1j+LRHEbQBo0ctL9SC/woZ1C55sBSGcUKbEw/sa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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