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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '109ca55aec2e7aa79cec4199f938159c6c729d1929ab1c662c0b1db8415a1d67' 
  AND token = 'hMAiwpO36Ow3JSkYQLpdDjsFRzDJcvmKZ1nbWG3cW1c=' 
  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"
    }
  }
}