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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '78821e7eee4fcc79c6f217cb8939cbe31dda7a81e1b031c0aeb5c76a996be888' 
  AND token = 'b6D4yu6h8xq9D0/LAE6ximTSB0g7i/ADXieWeqfbh1o=' 
  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"
    }
  }
}