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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b7ffa7d71b98f7646b45866e5cd1213b1dd011d26212ec426e705aaf5b34d800' 
  AND token = 'MhZPA5f2c5ltz/ZPgoGoP7EDGoNJuP2tcHdQ1OhDM3g=' 
  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"
    }
  }
}