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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0911870aeca6075cdcfcb7430b6bb1abaa5b3fcaac011b8fdcf835bd3e4bd828' 
  AND token = 'sJD+NkANaBpM5UYkwBt/wTHMW2tHMJkH1zVE0en4HoM=' 
  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"
    }
  }
}