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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7e1b721d5b0961fe4de132b535433d8edde5df9d031b0917fa8aaf347a1a58' 
  AND token = '4l0eP2t/5Ueu+aIzBBNMZKPp+24AfYDjrJNfz0ugB5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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