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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '587958ffada7e8759357f5fe5b78d7296f51a98e28359ff09b1b3a088425237c' 
  AND token = 'WsWQCkKuP67ePybtlMXp3y6+0D2i9ne3+JuWp35FkNo=' 
  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"
    }
  }
}