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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '914f9ff98102a1e04d7276eafccbd15f709a96949a80aa004c636c35e8b0f5eb' 
  AND token = 'JkjNdcVIJkNYtF1uL19rudMc6Dux1o5N++FQ27nxKVY=' 
  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"
    }
  }
}