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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a91b8c7d942f6b93748d6c235cd04ab40f1cb979bc054f15d2f82424d7da0bdd' 
  AND token = 'V9iMRK0sbAjn9FvruloeNAGMCMk9+FttJEhNYsjiqlk=' 
  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"
    }
  }
}