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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b8225843e92bb186993c880eb738dd26127175360b447bd353a74283db0be688' 
  AND token = 'kR7iWZ/nMDgq009n+lAB8Kf72bTNhfgFK4V/N/JgIXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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