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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1a40021c12ee18e612abfd630ef7bdf1d88b50b2ff4a83053a5c772a298de7d9' 
  AND token = 'xmwWvokuewIdozE/FDrGEHqYjXa+4wcRhq2ReReu1kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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