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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3366a1275b3c3f27fd3695742c5ca377b9e8b1e3f6b7d74e144d58bc35c06b' 
  AND token = 'MikERcjoN3mbGqgkAvhGshRtA+PJq+IhxnxUTRGd3Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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